<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta content="0" http-equiv="expires">
    <meta name="renderer" content="webkit|ie-comp|ie-stand">
    <title>hello, world!</title>
    <style>
        * {
            font-size: 24px;
        }
    </style>
</head>
<body style="margin-left: 50px;">
<p>当前页面的url：<span id="current_url"></span></p>
</body>
</html>
<!--注意引用的路径-->
<script src="../js/jquery.3.2.1.min.js"></script>
<script>
    $('#current_url').html(location.href);
</script>